The 20 is a small frame gun. Not a darn thing wrong with the new ones either, I prefer the older guns, but the new Wingmasters have really nice fit and finish.
They do get a TON of money for them and if you look hard, not sure how soon you need one, you might find an older one NIB that is a nicer gun IMO.
A NIB 1969 Wingmaster with chrome lifter would be the mother of all cool gifts.