Richard -- After searching for the last year for a decently priced version, I finally got one.
I see no date on the front, side or rear.
The only item I see up front number-wise appears to be more of a mold number.
By the way, the two water pipes at the top are tough to remove. I finally found a bolt that fit tightly into the pipe, heated the heck out the casting in that area with an acetylene torch, used a curved set of vice grips to grip the pipe and the bolt shank and then twisted and pulled out the pipes.
[yellow caps keep out glass media]