There were 3 main styles of forks that came on the post war Monark Rocket framed bikes from that era. The strut rod version, the standard double spring fork, and the single spring fork. The men's fork tube is approximately 1 inch shorter than the women's fork and will not work on a women's frame. Both men's & women's forks used the same size springs but the women's version had a spacer to compensate for the extra length. The spring spacer makes it easy to tell the difference if the fork is off the bike. I have, or have had 27 Monark Rockets, most of the 1953 rockets I've had came with the single spring fork, but I have had a couple with the strut, and double spring versions, so any of the 3 would be correct for your bike.
I should also note that Monark came out with the knee action springer fork on their Super Deluxe models in '53, But I have never seen that fork on a Rocket frame bike.
Hope this helps!
View attachment 1487083
View attachment 1487084
View attachment 1487085
View attachment 1487086
View attachment 1487087
View attachment 1487088