Yours appears to be a Type 2 (1885-88) or Type 3 (1888-92), which did not
have the cutter adjustment wheel.
Check out H-frame, the site for vintage Black & Decker Workmates:
From: oldtools@g... [mailto:oldtools@g...] On Behalf Of Dan Beck
Sent: Wednesday, June 09, 2021 2:49 PM
Subject: [oldtools] Stanley 71 #photo-notice
1. why doesn't my 71 have the height adjustment mechanism? Is this something
older versions of the 71 didn't have, or is mine incomplete?