I added the following from my comments copied from The Collectables Section:

Hi All,

If it of any interest to getting a list of numbers going...

I have a walnut Airsporter S bought from Ramsbottoms in 1985, £85 delivered by post, wonderful days!!!

Still as new in original box with tags, etc.

A label on the end of the box gives the following:

BSA Airsporter S
Small stick on label - 0.22
Air Rifle Carabine A Air
Number: GP2728

In a box on the label, G is written in marker pen.

Kind regards all...