Here's what a 24 looks like.
24 inch huffy customliner. No headlight. Other than that original. Plus shipping
thecabe.com
Since it doesn't say "Huffy" on it, it might be pre-53 (a guess because of the name change to Huffy in 53), or maybe a private label bike.
Most of the 26 tanks are huge and different looking compared to this, but here is a 26 with a similar tank to yours:
1950's Huffy Customliner Deluxe. This is the cousin to the Huffy Radio Bike. They share a lot of the same parts. Nice original condition. Chrome still has luster. Paint is in nice condition. Original/period correct tires. I've never ridden it and can't speak to how it rides. I also think the...
thecabe.com
Does it enclose the top tube entirely? If so probably 24.