The S&G environmental padlock was prototyped in 1981 and once the contract landed with
the Government/railroads they launched the Environmental padlock @ the ALOA trade show in june 82"
Master lock # 19 was made for the railroads and was used from 1978 (Red bumper)to the early/mid 80's
Abloy replaced the #19 but,didn't fair any better.
I heard that some environmental padlocks were in the field for nearly 30 of service, thats how good they are.
The environmental railroad padlock did unitize a stainless steel shackle which is very
rare, in 9/16 Diameter shackle and padlocks commercially available from early models with 1/2 shackle to later models with 7/16-3/8 & 5/16 diameters.
stainless shackles on the LEFT & case Hardened on RIGHT.
The S&G opens the Abloy & vise versa.