[Hammarlund] HQ140X questions

[Richard Knoppow]

     I have seen the date stamps on the filter cap of an SP-600. I am 
reminded of the scrambled serial numbers for Bausch and Lomb lenses. I 
tried to track this down for historical purposes at one point and 
discovered that B&L used a different series of numbers for each type of 
lens, so B&L Tessars had different numbers from B&L Protars which were 
still different from B&L microscope lenses. Further, they used colored 
dots on many lenses, some indicated coating some other things. I have 
this stuff all filed away on my archive drive but its not very useful. 
There are other products with scrambled serial numbers, sometimes 
because the manufacturer did not want the age to be known and sometimes, 
as with 1950s Graflex cameras, they just were very sloppy. Graflex has 
duplicate serial numbers on some products. OTOH, Schneider, another 
German lens maker, has completely progressive serial numbers for many 
decades.

On 12/13/2023 11:45 AM, Les Locklear wrote:
> Regarding Hammarlund receiver serial numbers. The only way I am aware of 
> is to see the date code on the Crystal, the filter electrolytic can (if 
> original) or,
> a stamp on the inside of the front panel.
> 


-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998