The case is heavily sanded down. The watch is a mix from various models. For example, the dial is from an older Super Jet model. The 24-hour ring doesn't fit either.
This is what the model should look like:
The reference number identifies a specific watch model. Different reference numbers may indicate different bezels or different finishes. At least in the case of Enicar, the reference number does not indicate the case material used. As you can see from the catalog image, your reference number 147...
If the seller cannot provide proof that this version was specifically manufactured for the Japanese market, I assume it is a DIY project, since theoretically I can use any Enicar dial with a tachymeter scale. Even if the watch were a special edition, I would not pay the asking price.
Here you can see the difference between the two bezels and dials.
I have found that the bezel on the ref. 147 05 01 often fades. I myself spent 11 years searching for a model in mint condition.
It is the case of a “cousin” with an Enicar dial. Many of these Sherpa Graph-like watches have 4073 stamped on the case back.
This probably indicates that there was only one manufacturer of this case model.
The Enicar Caliber 350 is based on the Orient Caliber 64100 from 1973.
There are 2 versions: The first has two different cells 392 and 393, the second (as installed in mine) two cells 393 (LR 754, AG5,...)