If 'Y 6 1' is a danielson style date code it would have to be 1961.
There is a close , interesting sequence of events here. The first usable spring wire clamps are probably after 1954 when Golden's patent fixed the fact that clamps formed as a circle were not in fact circular when streched around the hose. That patent went to Eaton Mfg.
The earliest pliers I find are shown in a 1957 patent, that fixes yet another 'circle is not round' issue. (2793414)
The Corbin trademark was not registered until 1964, but probably was in use a little before then (reg to Emhart Industries, who also held some patents for spring clamps)
Now, the interesting thing is, Lectrolite Corp goes away in 1962, because SK bought them, so if 'LC' is in fact them, the pliers were made for a very brief time, and by a third party as contract to a company selling them as contract...a very odd thing to do...
The craftsman catalog for 1960 does show hose clamp pliers, tho as the Dunlap brand..
As a stray oddity, the first spring wire clamp goes back 60 years before, to 1900 (647693), it likely worked, but had no ears, so there was no way to get it off afterwards, and it probably wasn't all that much fun to install either..(The ears came in 1935 when a fellow adapted it to hold the nipple on a baby bottle)
