The Project 10 Falke frigate developed between 1952 and 1955 but ultimately the Volksmarine brought four Soviet Pr.50 Riga class frigates instead. Specs are very sparse, basically between 1,200-1,500 tons displacement but no dimensions are known. Armament is very similar to the Pr.50 with three 100mm, three twin 37mm, two 533mm torpedoes, two RBU-2500 and depth charges and mines.
Thanks to Golly's assistance with the underwater hull and a photo of a model of the ship I've been able to complete this drawing. Golly and I both agree that the scale on the plan is unreliable. Rescaling the drawing to the indicated 95 metre length not only makes the Soviet gun parts too big but the superstructure decks become only 10 pixels high! On the estimated length I've scaled to, the armament fits perfectly and matches the plan and the other features look right. Therefore the real length was probably over 100m long. I make no 100% accurate claims though beyond saying my estimate is probably nearer the truth.
EDIT: Thanks Rhade!