While the original two-seater Thunderbirds of 1955-57 share a similar look, there are some easy-to-spot differences that make them simple to identify by year.

Through the six decades and 11 product generations of the Ford Thunderbird, the two-seater Baby Birds of 1955-57 must be the most beloved of the entire flock. And while the ’55-’57 T-Birds all follow the same styling theme from the start in ’55 (above), there were significant differences in the three model years that make it easy to differentiate them.

One interesting thing about that: The most significant changes in the Baby Birds weren’t simply changes for the sake of change, as is often the case with the Motor City’s annual updates. (Planned obsolescence and all that.)  Here, it seems, the changes were made to improve the product in a material way. As always with the MCG Car Spotters’ Guides, we’re not going to detail every single difference in model years, only the most easy and obvious ones to create a handy reference.

One shortcoming that soon became obvious in the autumn of ’54 with the launch of the ’55 ‘Bird was the spare tire location, which in hindsight seems almost like an afterthought. As we see above, the spare takes up nearly half the trunk volume. Note also the dual tailpipes that exit through the bumper guards, a ’55-only feature.

The factory photo above provides a handy schematic view of the changes for ’56. First, the spare tire was moved outdoors with the addition of a standard continental kit, freeing up valuable trunk space. Meanwhile, the tailpipe exits were relocated to the extreme corners of the rear bumper (just visible here).

Manually operated fresh air doors were added to the front fenders just forward of the doors to improve cabin ventilation, which was especially needed with the fiberglass hardtop in place. (The lift-off hardtop was standard, while a folding fabric top was a $290 extra.) Then partway into the ’56 model year, the famous round quarter windows for the hardtop became available, as Ford addressed owner complaints of claustrophobia and poor visibility. A Baby Bird trademark, the portholes were available on ’56 and ’57 models, but many ’55 T-Birds have been retrofitted with the distinctive feature.

Another change for ’56, minor but noteworthy: On the ’55, the emblem on the front header panel and rear fuel door was a tri-color Ford crest with crossed checkered flags.  For ’56, the badge was changed to a stylized bird with spread wings and script. This motif, constantly evolving, was used on Thunderbirds for years to come.

The ’57 Thunderbird is the easiest to distinguish. While it shares the same 102-in wheelbase chassis as the ’55-’56, the body is six inches longer, mainly in the rear deck, while the deck was raised slightly as well. This allowed the spare tire to be moved back into the trunk and stored vertically, along with presenting a longer, sleeker appearance.

The ’57 front and rear bumpers are heavier and more elaborate than the slim, straight pieces on the ’55-’56. But here’s the most obvious tell of all: While the tail fins on the earlier ‘Birds are stubby and vertical, on the ’57 the fins are sharply defined and rest at a 45-degree angle. For us, these are the easiest ways to tell the three years of Baby Birds apart, but there are certainly more differences. Feel free to add your own in the comments section below.