A five cent raise in today's currency or back then? Per hour or week?
Assuming it's hourly, if it's from "then" could you convert it to modern currency, or present it as an percentage increase so we can understand what kind of relative increase that was?
Five cents sounds like nothing today, but 70 years ago it would have been significant.
Figuring out a percentage increase is a bit complicated without knowing how much mod's grandfather earned. According to https://www.archives.gov/publications/prologue/2012/spring/1... in the 1940 census average (yes, not median) annual income was $1368, which works out to $24,505 in 2018 dollars, or $12.25/hour assuming 40 hour weeks and 2 weeks of vacation.
So at a guess, $0.05/hour was less than a 10% raise, but more than 1%. I expect it was /hour, not /week, because weekly wages would have been in the ballpark of tens of dollars.
Disclaimer: I am not mod, and this is not my grandfather we're talking about.