Age / Date on Laars Boiler

I ran into a LAARS Hydronic Boiler. The data tag was faded but looked like:

Mdl: LCR-630 (or LCK-630) S/N: 126741

Size 630,000 Btuh Input / 504,000 Btuh Output

Not seen a lot of these in my area. Anybody got data on reading the age??

Anybody Familiar with LAARS Boilers