OK, here we go, I have only collected info on military speedo's, but think civvy stuff would be about the same, exept for a chrome sharp bezel.
For now I will skip the prewar and early war stuff, as that is still being researched.
So during 1941ish till 1944/45 we had this type of speedo, round bezel only, first picture has wrong bezel on it, but has only "S433/L" on the face:
This one is the successor to the one above, and has "S433/M or S433B/EX or S434B" on the face:
Then possibly 1945 to 1949 we had this logo on the speedoface, both round and sharp bezel has been encountered:
Then we get to the 1949/50 to?? era, with the new style Smiths logo:
This is just the start of an attempt to categorise Smiths Chronometric speedos, so any additional info and pictures are very welcome!! especially the prewar, and early war types, I will come back with more info on those.
Cheers,
Lex Schmidt
email (option): welbike@welbike.net
Hello Francois,
Here the speedo in question:
This one was used on a WD bike, as it has a matt chrome bezel, and with a sharp ridge, it has the "Jaeger" type drive, and needs the thicker special cable.
Sofar, we have discovered that only Matchless G3WO's had one contract with a trip setting, rest was without trip as above.
Upto 1940 alu tags were used on the bottom, after that brass, to preserve aluminium.
This type of speedo was in use till 1942, at least I have a picture of one dated 1942.
But they can also be encountered with the "normal" cable, as early as 1940, as seen on BSA black and white pictures, these speedos also have the orange 30mph stripe.
There is more, but still investigating, but it's a potential minefield!!
Anyone knows how to use the "dating circle" on the back??
Cheers,
Lex
email (option): welbike@welbike.net
Hi lex,i just looked in the parts list for the M20 / M21 1949-1958 there are 11 speedos listed as for M20
19-2108 80 mph cowl fitting up to 1954
19-2118 140 kph '' ''
19-2111 120 mph ''
19-2117 180 kph ''
19-2122 180 kph '' up to 1955
as for M21
19-2103 80 mph '' up to 1954
19-2117 140 kph '' up to 1954
19-2109 120 mph '' up to 1955
19-2121 180 kph '' up to 1955
as for B33
repeat of last two items
so from this it seems a bit of a minefield unless only the face is differently marked
hope this helps someone
cheers Rick
email (option): richardholt@rocketmail.com
Lex i've been going boss eyed looking through the BSA 1939 parts list which covers all models including my KC10. It's an awkward book to follow and although it shows all the different drives/cables/brackets, I can't find mention of a speedo instrument. Here is my speedo(Jaeger)and I have no reason to doubt that it's the original. It also has trip and illumination. The wiring diagram in the WO stamped instruction book shows provision for illumination. I expect it's exactly the same speedo as fitted to civy models...minus bright chrome. Ron
email (option): ronpier@talk21.com
Ron, thanks for the info!! everything helps.
Roger, I had thought along the same lines, but first, probably in 1940, there was the small dating circle, then possibly in 1941, the big one was stamped on the back, so where did they start, 1940, or 1941??
See here a sketch:
Does that seem right to you? someone must have some info on this???
Cheers,
Lex
email (option): welbike@welbike.net
Yes I did give up Neale, on the assumption that it was an optional extra in 39.
My C10 does have the clamp on Jaeger type cable. Here is the same thing on my Big 4 in case anyone hasn't seen one. Ron
email (option): ronpier@talk21.com
Hi Lex,heres a little download from Jaeger,shows a few speedos but no date
unfortunately.may give a little help.
http://www.hells-confetti.com/Technical%20data/Jaeger%20Instruments/British%20Jaeger%20Dashboard%20Instruments.pdf
cheers Rick
email (option): richardholt@rocketmail.com
Nice bit of info on those Jaegers. Thanks Rick. Here are some of the speedos I am working on. Bottom is actually a clock with 24hrs capabilities for a car, right one has rivet and plastic glass replacement. Comes from a late 44
email (option): unpob@yahoo.com
unfortunately.may give a little help.
http://www.hells-confetti.com/Technical%20data/Jaeger%20Instruments/British%20Jaeger%20Dashboard%20Instruments.pdf
cheers Rick
Rick, interesting, but probably from 1933ish, so before our interest, but appreciate you sending the link!
Cheers,
Lex
email (option): welbike@welbike.net
The Norton speedo and bracket with very low miles that Jan got from France is dated 11/39 on an ali plate and both parts are finished in KG No.3 (It is of course a non-illuminated, non-trip). Definitely a Norton bracket (and correct Jaeger cable, I know that as it's on mine now 
).
Unfortunately, I can't see if I've got a record of the type spec. from the rear plate.
Magdyno plates changed from ali to brass around 1940 - 41 based on what I've seen.
I imagine from the construction that the Smiths type cable was cheaper to make (although the threaded connection would have been dearer). It looks as if BSA changed over at the same time as they introduced the 'pancake' style drive instead of the brake plate mounted type.
Hi,
In my quest to try get an original Speedo for my 1944 WM20, I recently found this.
Anyone know what year and what bike it was for? It seems to have some military paint on it (brown/rust).
email (option): brandon.stovold74@gmail.com
Hi Ron, the fitting is this one.
Its possible someone fitted this dial to a different speedo..
email (option): brandon.stovold74@gmail.com