Older collection, keep, sell or refurbish?

[luke]

In my uncles cupboard were a few older air rifles. These were passed to me and again have sat in my cupboard.
This seems a waste, but to be honest I've no idea what to do with them. I'd appreciate any advice people have got for me on if these are collectable, desireable or just taking up space.

#1 - BSA Mercury .177
https://imgur.com/a/inSdu
Shoots well at 7.6ftlb last time it was tested.

#2 - Haenel Model 312 .177
https://imgur.com/a/AAi5K
Complete with diopter and adjustable butt plate.

#3 - Webley Hawk MkII .22
https://imgur.com/a/5HTyU

#4 - Webley Mk3 .22
https://imgur.com/a/uAdhT
Shot at 7.9ftlb last check

#5 & 6 - BSA Lincoln Jeffries - .177 and ?BSA Light?
https://imgur.com/a/DUfEL

One is marked Birmingham Small Arms Company - BSA Air Rifles Lincoln Jeffries Patented with a serial #3640
The other is unmarked apart from a serial #L14877
Both shoot surprisingly well!

Is there any market for these guns? Can anyone supply any info on the older guns?