1971 is an interesting year for Masi. The Gran Criterium was introduced in 1970 basically, there are a few who claim 1969, but that might have been just trade show production.
In 1971, details started to settle down early bikes are different in details from the late year frames. The Time of the year is key. All are desirable but some more so. Value might vary a small margin by how you measure 54 cm. Masi measured and stamped the size under the bottom bracket shell. If you measure center to center and come up with 54 the bike will have a wider audience than if it is 54 "masi measure" which is center to tip top.
Plenty of images.
Some will want to know the date stamp on the fork steerer, for others the details will be enough.