Some form of achievement?

@ Jim: no

@ Aktung: very good reasoning, but no


https://i.imgur.com/VB3cetW.jpg https://i.imgur.com/zR9J2AI.jpg


Here's another clue:

https://i.imgur.com/dzl9Qw8.jpg


Edit: Again, photo 1 shows the thing photographed on a white background for illustration/display purposes - the other 2 pics present it in its normal place

Belonging to a particular Regiment?

Yes, very importantly

Lincolnshire Regiment?

Nope

Still in existence today?

Amalgamated

Royal Anglian?

Nope

Amalgamated after WWII?

Yes

70's?

more recently