I think these people were not the engravers, but the directors of the mint at the time of minting ...
http://coinz.eu/fin/3_fin/07_markkaa_5_1946_1952_finnish_coins_en.php quote:
"On Finnish coins produced after 1945 the following initials of directors of the Finnish Mint can be found:
• S - Isak Gustaf Sundell (in years 1912 - 1947)
• L - Vesa Uolevi Liuhto (1948)
• H - Peippo Uolevi Helle (1948 - 1958)
• S - Allan Alarik Soiniemi (1958 - 1975)
• K - Timo Kauko Koivuranta (1976 - 1983)
• N - Reino Tapio Nevalainen (1983 - 1987)
• M - Reino Tapio Makkonen (1987 - 2006)"
Yeah, it's best to be the top of pyramid, if only with ONE single initial You certainly noticed that a family tried to get a monopole on the director's chair Here the last:
This a strange site (https://markyourcoin.weebly.com/helle-peippo-uolevi.html) since it doesn't say anything about being a blue- or white collar person