Dick,
I have a modest collection of superlights and find them and their variations very interesting, and the shooting and field use of superlight weights great for me.
First of all let me introduce myself as a card carrying Browning nut..........here's my shrine:
Here's a box end I came across:
On the left is a 72 12 gauge underside with script, and the right is a 69 12 gauge without. The 69 is solid rib, slim forearm with crossbolt, non fluted comb, inetia trigger; the 72 has vent rib, schnable forearm without crossbolt, non fluted comb, mechanical trigger
All the catalogs I have refer to them this way:
here's a '69 price list vs a '76 price list: