I'm not sure what being a front loader has to do with what luminescent material was used.
Righty or wrongly I assume these early, pre-DeVille front loaders could be radium. Granted they may fall in the period when tritium was used, but prior to the T's being a legal requirement, but I believe the first 14770's came out in 1960/61 so radium may well have been used.
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