I've seen this described as Tom's best picture.
There's an endearing feeling of nostalgia as Tom's musclebound cop (his 'alter ego'),
extends a hand to the younger generation, each dressed for their own era. Tom was 65 when he drew this and AIDS was at it's height, decimating the gay community, so it seems an appropriate gesture. Note the envious horse!
My article on Tom of Finland
in the 'A-Z of Fetish Artists' series comes in 9 parts
Repeated misfortunes and a lasting obsession.
Spanking, bondage and leather. Tom returns to the barricades.
In addition, there are other articles about Tom of Finland here:-
Tom and Fascism - the historical background
The Petulant Leatherman - surprising attitudes and unexpected emotions in one picture
Boot Worship part of an article on another artist
Bar Predators, Bar Predators Revisited - reviewing and extending a popular series, arguably his best work
Beards in Tom of Finland - their frequency and significance
New unearthed artwork - 3 motorcyclists cavort in mud, from 1959