Price guide please on these

[thumbhole]

I have the following items surplus to requirements and wondered if you new fair price to charge.
12 Ltr air cylinder gauge an hose april 2006 test
Simmons white tail classic 4.5 -14 x 40 as new boxed etc
Simmons 6-24 x 50 no box came off rifle I have no marks from mounting
Theoben rapid walnut stock excellent apart from hole in base was fitted to my Elan.
Dont know what these are called but have two they screw into main body on rapid mark one and the bottle then screws into (both different 1 longer than other 1 has 1 hole between screw threads other has 4 )
Also got rapid bottle filling adaptor not used it but think you put on bottle an then attach some for of a clamp (maybe its to fill at the dive shops ? .
thanks if you can help with prices.
Regards Marc

[thumbhole]

Bottle is 207 bar sorry forgot to put.