Don't have pictures for general consumption but I just got a stash of Parker parts I shelled out 500 dollars for on eBay. They included 30 or so NOS clips from early Senior Duofolds to blue diamond 51s as well as around 25 NOS filler units for the early Vacumatics in all three sizes. The four NOS clutch rings for Parker 51 are a trip. Pretty neat. I'll post pictures later.
Ah, pictures. This is maybe 75% of what I purchased. I'm currently selling one Early Senior Duo NOS clip with inner cap on eBay to try and establish value.
There aren't any Senior sized Vacumatics though I did get two OEM replacement Senior sized Duofold black barrels. All the early Vac filler units are new old stock. I'm going to have to replace the sacs, nipples or whatever they're called. Most of its NOS, Duofold to 51 era.
If somebody out there needs something, you might be able to pry it loose from me.
I don't know what the largest size is but the smlles size lockdown filler unit I need is about 5/16" od threads. If you have one let me know what you need for it.
Cheers, Dennis
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Tu ne cede malis sed contra audentior ito ~Yield not to misfortunes, but advance all the more boldly against them
Do you have a caliper that measures in thousandths of inches? ie .087 for instance. I've measured all three sizes and basically rated them that way. One is a Debutante, next a Junior and the last a Senior.