After seeing pictures of the car, Mr Marc Florie, administrator of the AM101 register wrote:
"The side vents were optional, and you can see them on my website at 101-102, for example. http://www.am101.org/3500_thecars_1.php
The orange side indicators are probably not original.
The rear lights seem to me to be original for early cars, except for the glued-on reflector on the bottom glass. The brand is Siem, and they were replaced in 1960 by a slightly larger reflector (Altissimo / Carello). They are, it seems, deeper in the body, so you hardly see the chrome surround. I haven't seen this like this before I guess, but it's always difficult to see from just pictures.
I also notice the other instruments, but I know that early cars had different ones than later ones.
The engine is early with external oil pump and oil filter and a different timing chain tensioner. Seems original to me. The internal engine number 105 on the front left could indicate a chassis number around 101-210 as the cars were only numbered with even numbers.
It already has the front triangle windows in the doors but no chrome trim on top of the rear fenders. I would expect the latter to be original."
When researching this car, one of the previous owners emailed the picture below. He wrote:
"I quickly found a picture I took without the front bumper at the time. Please note that this vehicle had "French' language instrumentation for items such as the Fuel Gauge and Water Temp Gauge names etc. As part of what I understood were modifications made in Europe to this car, it had no chrome trim strips on the tops of the rear fender line, and the rear tail lights were "frenched in" or extra metal was extended out from the rear fender around the taillight lens area. I owned this car in the mid to late 1980s and purchased it in a local private sale from someone who brought it in from Europe. All documents relative to prior ownership of the car(several owners in Italy) were provided to the next owner who resided in the Baltimore, Maryland USA area. Besides repainting the car, I rebuilt/ refurbished many items, including the starter, carbs, master and slave cylinders, fuel pump and brakes, and replacing the original headliner with a matching fabric found locally. You will find that Maserati used various parts from UK Vendors such as Salisbury and Girling. If the car is running, please ensure the owner puts in about two(2) gallons of 50 wt oil in the sump and that the engine is fairly warmed up before proceeding down the road. This car was designed to cruise over 100mph all day. The trim piece I have for under the front hood is a cheap sheet welded aluminium angle in a squarish size that fits around the perimeter of the engine turned under hood insulation matt, and that also had a small fixture on it for a light. Probably a replacement could be fabricated cheaper than the cost to ship it internationally. I will send you a photo. As an aside, I was probably hooked on the 3500GT at an early age as there was a convertible driven in the movie Love Is A Ball with Glen Ford as one of the actors circa 1960s.