The Hurds were first advertised for sale in 1946. So 1946 would be the beginning of sales even though the patent wasn’t granted until 1951. There does not appear to be any time frame that started or ended any of the series of serial numbers .
Before going any further, the serial numbers are found on the under side of the reel body just aft of the nose cone. The shape did not lend itself to consistent/accurate stamping, so they might be hard to read.
There is no exact writing reflecting periods of time for Hurd serial numbers. The oldest/lowest serial numbers had black plastic grasps on the crank handles. The black plastic handles were grooved just as the later aluminum/magnesium alloy ones are. They would carry serial numbers 1 thru ?. Black plastic grasps shown in photo below. I have a number of Supercasters with black plastic grasps and ser. numbers above 1000 to believe the first generation stopped at ser. number 1000. It is not logically feasible that there were a bunch of black plastic grasps laying around to apply to later models in order to make them appear older and possibly more collectable and or valuable. I am also convinced that there were no Changes in the ser. no. schema until they began the Letter series of serial numbers
The next Series, the lettered series had metal Grasps (Alum. Magnesium alloy) Grasps and would carry serial numbers sstarting with the A Series
A series – ( the letter “A” could have been before or after the Numbers
C series – (the letter “C” could have been before or after the Numbers
R series – (the letter “R” could have been before or after the Numbers
AC series – ( the letter “AC could have been before or after the Numbers
ACR series–(the letter “ACR” could have been before or after the Numbers
Note: I track and record all Hurd serial numbers I find and have yet to see an “C” or an. This leads me to think the doesn’t exist.
I also have yet to see the last number of a series run sequentially with the first number of the next lettered series.
We may never figure this out.
The all Black Saltwater series: – very little is known about the black corrosion resistant coating called out for certain parts on the schematic. My source, whose father was the Superintendent of the Hurd factory believes it was the same black baked on paint that they used on the rods. I own 6 of the Saltwater Models and do not find any special serial number sequence or dating series for them.
A true Black Salt Water reel, would have the Hurd Insignia stamped on the left side cover. They did this to prevent someone from painting their Supercaster black and calling it a Salt Water model.
Note: The Hurd Logo is always stamped on the right side cover just forward of the crank. Here is a picture of the Hurd Logo that will normally be stamped on the RH side cover of a non salt water model . The same logo will be stamped on the LH side plate of the Salt Water model.
Note: a Hurd schematic will identify what parts will have the black corrosion resistant coating.
Note: there are many salt water versions seen that have lost the black coating. They will still have the Hurd logo on the left hand side plate.