I haven’t asked nor found the answer for a couple years, so I hope it’s ok to ask again. Does anyone know when they added the makers mark “s” to combo wrenches like the one above?


Thanks, 3bay - a friend of mine thought the same thing.I’ve seen a couple of those but not sure exactly what it is. Maybe a brake adjuster.
What size is the 8-point opening? Measured for a square nut.Here's an interesting Proto wrench - it just came from a flea market. I can find no info at all on it.
It looks like the fairly common pebble flare wrenches, but the head is very beefy, and it's 8-point.
Internet Archive doesn't seem to have a catalog old enough for this to make an appearance.
Anyone?
It's 1/2".What size is the 8-point opening? Measured for a square nut.
The part number follows early Caterpillar, but nothing shows up in a search. (number-letter-number-number-number) later on they added another number just after the letter, so 4Y187 became 4Y0187.
1/2" square is the size of Ford truck mechanical brake adjusters from 1928-1938 model years. I see Ebay listings that claim these wrenches are for "Tool Post" screws, but don't believe that.It's 1/2".
Nice work - sounds like a match!1/2" square is the size of Ford truck mechanical brake adjusters from 1928-1938 model years. I see Ebay listings that claim these wrenches are for "Tool Post" screws, but don't believe that.
You make a great point Frank. However, even Craftsman has the 8 pt double end 1/2 x 7/16 brake wrench in V series which was what, 50’s-60’s.The Plumb/Plomb lawsuit was in 1946. It doesn't seem like Proto after 1946 would make a wrench for 10+ year old vehicles. But then I dunno.
A man's gotta have a dream....(but not at the e-bay prices: somebody is hoping to get $1900 for 2 NOS pairs).
What is that wavy matte finish ratchet?
Yeah that guy is on crack. That’s been listed for a year and is absolutely insaneThis looks fantastic, Don
... Adding to the mental list of the things I want... (but not at the e-bay prices: somebody is hoping to get $1900 for 2 NOS pairs).
That is a ratchet that I purchased from a website that basically deals exclusively with bike tools and parts, etc.....they are called Birzman.What is that wavy matte finish ratchet?










Nice ones!! Congrats Don!When I saw these I wanted some. I‘ve been known to do some fishing. I finally found some listed at a fairly reasonable price. They arrived yesterday.