Hey, thanks for the input.
Uhm.. yea, that is what i was thinking, the way to know the approximate year made is to check what does the sn# says on the back of those CTS pots, but due to the nature of the instrument, going there and the whole dismounting process equals to a very delicate archeological type of cave excavation/exploration. I will stay away of that, and will consider it was made somewhere in between 1965-69
Regarding the tuners, definitely not original Kluson/tulips they used to put on a 175 of that year, i believe i have managed to find the make and origin of those and here i'm asnwering myself to my question:
they would be Gibson Nickel/Chrome tulips of the 1970's coming from a LES PAUL / SG! and it is wrong to put those on an ES175, and i decided to get rid of those and give back to the guitar its original state.
On the pic of the back of the headstock, you can still see the original holes left by the original Klusons!
so i already managed to find a set of original Kluson/plastic tulips of late 1969/early 1970's - it was a pain to find, i was lucky to find a set for not too expensive, (because those usually are going for $250/300+ on ebay)
The other thing that i will change (easy to do) is the bridge. That actual brazilian roose wood single block bridge has string spacing too narrow for me, i have mesured the string spacing at the bridge it is 500mm exactly, while standard string spacing is supposed to be of 524mm (specific to ABR-1), and an ABR-1 is what i'm going to put on it., Accordingly to what i had on a ES175 of 1991 i owned before, i prefer more character and brillance at the attacks and this is strict personal preference for my grouby fingers i'm more comfortable on a wider string spacing. - i presume, no harm will be done by swapping the wooden bridge for an abr1 and adjusting/setting up the harmonics accordingly.
cheers.