Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327 
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Post by Adrian-VTA on Oct 20, 2014 22:10:16 GMT -8
Start collating here
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Rod
WS Benefactor
Posts: 2,213
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Post by Rod on Oct 21, 2014 2:49:28 GMT -8
A start…
The main issue with BellMatics is that you can swap dials, rotating rings between models so there are lots of franken Bells out there. The two base models are the 4006 (day, date) and the 4005 (date only), the 4006 comes in 17 and 27 Jewel varieties the 4005 27 jewel only.
There is a rarer 4006 that has only 21 Jewels that was made for the American market. Be very careful buying these as they are often rebuilt frankens.
In rarity the Nov 1966 dolphin case back 4006 is extremely rare, I know of only 5 and have been collecting serial numbers and info on these for 10 years now. Mine is the second oldest I have found. These have the Diashock 27 jewel on the dial and the dolphin case back and the notched case for the alarm button.
Then the 1966 Dec - Jan 1967 Diashock dial without the dolphin case back
The 21 jewel 4006-7019 would have to come next, 7 digit serial number (pre 1968) and very few seen, but they do come up for sale.
The 4006-7010 (generally from June-july 1967) Business Bell would be number four. Hard to find in good condition outside of Japan, strangely the all have an English only day wheel!
Lastly any of the 4005 models would come next.
These 4006/4005 movements are considered to be one of Seiko's greatest movements and are super reliable and keep excellent time.
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