Need help on Rolleinar lens with different specs

[Marco]

I got a Reflex-Rolleinar 500/8 with a minimum focus distance of 2.8 meter ( 10 in feet) instead the reported 1.5 meter ( 5 in feet), other difference are no 500mm written in green and just "Japan" instead "made in Japan".
Serial number is 8800xxx in an ebay auction I see listed a 500 with standard specs with a lower s/n 6400xxx, is my lens newer?
I know that should be made by Tokina but googling on specs on Tokina 500 I came up always with min. distance of 1.5 m.
Is not my only Rolleinar out of specs on Report 4 for the 400/5.6 is written made only in QBM IV my is QBM III.
If someone has some information about the 500 is welcome.

Marco

[Marco]

I have two other difference is missing the diaphragm indication 8 on SL35E you can view it in the viewfinder and the meters and feet writing are reversed on my meters is the first scale from the focusing line.
Than I find out that the passed sticker on the lens is this one http://trade.mar.cx/AT124212/ a trade mark registered in 1988 and cancelled in 1996.
And after looking on several Tokina RMC 500/8 I found one with the specs like mine on ebay now http://www.ebay.it/itm/251267231435 .
Now compared to the older RMC 500 apart the min. focus distance Tokina has done also some optical change on this mirror lens? In which year they revised the lens?

[eieikuean]