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I am fairly sure the last ones of C7353 were made much later than April. At least contract C9062 was built inbetween and possibly the elusive India Office machines as well.
The assumption of 1500 machines per month is also a bit high I think.
I extrapolated production many years ago, with 50 machines per day, 5 days a week, and came up to October 1941 but a problem is that it is not clear if they remained on a 7 days working week or less in 1941.
I am not sure C7353 machines were ever delivered from factory with panniers but it may have been possible as there is a contract for many sets in August 1941.
C10217 start production late 41 or early 42 was with panniers acc spares list.
Unfortunately, dating changes appears a minefield.
Cheers,
Rob
email (option): wd16h@telfort.nl
Steve, do you have the actual DME's too? I see many interesting things there!
Cheers,
Lex
email (option): welbike@welbi**.net
I am certain C10217 was first delivered in possibly November and definitly in December of 1941 so introduction on Nortons started before 1942, just.
Assuming of course that they were indeed fitted from the beginning of the contract.
Cheers,
Rob
email (option): wd16h@telfort.nl
Lex, on the balance of probabilities, most machines in service were retro-fitted with pillion and pannier equipment. The D.M.E. Circular lists the fitting of panniers etc. as "Immediate Action" (For Nortons effective 31/3/1942, BSA 10/5/1942, Ariel 12/6/1942 and Enfield 23/2/43).
Presumably "Immediate Action" circulars were not intended to be ignored.
I've looked again at the MoS ledgers and it looks as if "Instruction 5" which I referred to above may have been deleted in an amendment dated 30/9/41 and then there is a further amendment dated 5/2/1942 instructing the fitment to 856 machines at £4.3.0 as opposed to the £3.10.0 mentioned on Amendment 5 i.e. 13/- more expensive.
It's also interesting that Contract C10217 states "6/2/1942 - Alteration to Pannier Carrier and Pannier Bags" (@13/- per machine) This wording is repeated on the 14,000 conversion kits supplied under C11037 and the 140 under C11377.It looks as if the design had not been finalised until early 1942. Might Norton have developed the sliding stay ? :thinking_face:
If only the last 856 machines of C7353 were pannier-equipped ex-works, this would suggest from frame no. W42144 / WD Serial C4402170 and photographic evidence would seem to support this.
Here are C4402582 and C4402724 (the full numbers are not visible, but they don't fit with other contracts. Both have the Dunlopillo seat of the early type.
This is C4402777 - No panniers but the carrier and pillion are fitted.

Thanks Rik!! think I will go for panniers and Dunlopillo pillion! much better for my lower back!
Cheers,
Lex
email (option): welbike@welbi**.net
email (option): wd.register@gmail.com
Thanks Ron. This is indeed census number C4558184, with the later carrier but without the pannier frames. Looks as if Norton and BSA both had the intention to fit pannier frames, but the pannier frames weren't available yet...
More pictures pls... 😊
email (option): wd.register@gmail.com
With in service pictures it would seem much more likely that the frames had been removed rather than a part set fitted.
Rob
email (option): robmiller11(a)yahoo.co.uk
I had just asked for more pictures when Rob Miller sent me this one:
We both worked out that these were C9310 despite not being able to see the beginning of the number (C4558300).
email (option): wd.register@gmail.com
Unless we actually find documentation, there will be supposition about the reasons for pannier-type carriers without pannier racks and bags. It may be that they were not popular with some riders initially.
In terms of dating the BSA inception, I've been looking at the photos on our old friend Henk's CD.
Contract C9310 was for 9,000 machines carrying WD Serials C4553722 - C4562721 and numbered WM20 44213 - 53212. The first arrival at Chilwell was noted on 23/8/1941. Do the factory records extend this far with exact despatch dates ?
Anyway, Henk adjudged this one to be C4554743 : WM20 45234 so only a thousand or so into the contract. Based on the later style fuel tank, I don't think it can be from an earlier contract.
This is C4556635 - WM20 46126 but it has clearly been refinished and generally messed around with. If the rear carrier is a factory fitment then we're 2000 into the contract which would be early October 1941 production and still no panniers.

The BSA ledgers go up to WM20.70000
email (option): wd.register@gmail.com
C4584743 would be a WD16H...I'm not 100% on M20s but I know that ain't a "Sweet Sixteen" :grinning:
C4534743 was a Morris-Commercial.