8R "Optimus" embossed

I like these early 8Rs with the embossed Optimus logo.




I've read that these debuted in '59 and since this one has a nickel tank (probably left over stock from model 8 stock) I'm guessing this is in that timeframe.




Unique SRV assembly with it's long shafted PIP cup. A two day soak in acetone broke up the thread lock and it came apart easily. The pip cup accepts a pip of 5.5mm. A bit larger than most which run 4 or 4.5mm. This cork pip was in good shape and since I don't have a 5.5mm punch I decided to put it back in.




The original cap seal was replaced with one from the Fettlebox.




Runs great, cork PIP and all. Jerry

 

Good looking one.

 

Hello Jerry. Very nice example. I prefer the cork pips. They work well.
Put a drip of fine oil into the hole on the underside of the tank cap to keep the cork moist and so it doesn't stick to the safety valve seat.
John

 

Thanks guys!
I’ll try that John, good idea.

Jerry

 

Any one know when Optimus and/or Primus stopped using cork as pips their SRV's?

Cheers
Simon Foxxx
New Zealand

 

Hi @SimonFoxxx . I wrote this about the Optimus change-over date from cork to rubber for NRVs:

From this thread:
https://classiccampstoves.com/threa...ptimus-no-45-and-48-stoves.28117/#post-286793

Best Regards,
Kerophile.

 

Hiya Mr Kerophile,

This matches my understanding for the 111B I have, it has a priming fluid bottle and rag supplied when new. It had a cork SRV pip, and one piece rubber "cone" pip. My belief always was that it was early 1960's. Your information is helpful. Thanks.

Cheers
Simon Foxxx

 

Hi @SimonFoxxx . Unfortunately my research only refers to Optimus NRVs, as the SRV is designed to be tamper-proof for the user, so only the complete cap, or rubber packing or seal are listed in the parts lists of the catalogues.
Best Regards,
Kerophile.

 

Hi @SimonFoxxx , It is interesting that you recieved the spirit can with your early Op.111b. This is not to be expected:

From this thread:

https://classiccampstoves.com/threads/optimus-111-from-1950s.26581/

Best Regards,
Kerophile.

 

Cork pips can't have been used too much past 1962, do you think?

 

Hi @SimonFoxxx I have no direct evidence, but think it likely that Optimus standardised on “rubber” compound washers for NRVs and SRVs in the early 1960s.
Best Regards,

 

All good, thanks for advice

 

Very nice. I have one also. Embossed is boss.