Variations in old Apeks second stages (internals)

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scubaalblake

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I have multiple apeks regs…..ATX40, TX40, TX50.
second stages are all pretty much the same and I am very familiar with the internals Having servicEd many over the years.
just picked up a DST with two second stages from eBay.
ebay ad said ‘just serviced’ but looking at the filter it hadnt been done for years (which I expected)
i have serviced the first stage and one of the second stages for an oxygen reg - all good.

the other second stage is a little ‘weird’.
all the other apeks second stages have seen have a valve spindle where the adjuster screws to the inside of the spindle.
this second stage has a plastic adjuster that screws down the outside of the spindle itself.
it has a TX50 cover - but is different to the others I have.
it might be a TX50 - but if so it has different internals to the others I have.
it’s definitely old. Does anyone knows what it might be? Did the internals of the spindle get significantly changed at some time?

pictures of the spindle attached so you can see what I mean.
(cross posted in the DIY gear forum as well - as I didn’t know where folks were most likely to know the answer!
cheers
 

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