73 850 serial numbers

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is it true that some bikes sold as 73s were 750cc and some 850cc? if so at what serial number did the change take place?
 
First 850 was 300000. There are some odd mixes in the 235000 area, some 850's & some 750's but other than that a 1 or 2 at the start is a 750 and a 3 means 850.

Mar 1973 220000 Roadster MK V
Mar 1973 220000 Hi-Rider MK V
Mar 1973 220000 Interstate MK V
Oct 1973 230935 Last 750cc Commando
Commando 850 Apr 1973 300000 First 850
Sept 1973 306591 MK IA 850
Jan 1974 307311 Mk II and IIA 850
 
is it true that some bikes sold as 73s were 750cc and some 850cc?

Yes.

if so at what serial number did the change take place?

There wasn't a 'change' as such. ('73) 750s had 6-digit serial numbers beginning with '2' (2xxxxx) and 850s were '3' (3xxxxx).

(Edit: Yes, there are also a few '73/'74 850s with 235xxx serial numbers, the reason why is, as yet, unknown.)
 
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1973 (as sold to me) 3044** engine 1972 (as sold to me) 2008** frame just double checking
 
73 850 engine in 72 750 frame, probably titled in 73 as 72 model year production was a mess due to main bearing issues.
 
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