Found a UK RMP red Kangol beret (has the cap badge still in it) with a shirt from the mid 70s, and was wondering whether anyone could tell me anything about the tags I found on the inside? Like an estimation of the date and of the rarity? The shirt was dated from the 70s but off I can't 100% tell that this isn't a more recent purchase.

Here's a diagram of what's on the inside of the beret.

"55 (large font)

CF 8405-99-132-3746

Kangol limited

SL33B/4725

Dry clean only A 60"

If anyone could help me that'd be so appreciated.