Very old tissot gold watch. Identify please

Hello there.! My gradma own a very old tissot K18 gold bracelet watch. Last time(2010) i went to a gold shop and estimated this, they told me clearly it's real gold and it costs (depends of the weight of mechanism) 6.000€ -10.000€(price of gold year 2010) and novody could estimate the rarity or how old this is.For sure everyone told me to deposit on a bank case for safe cause it worths a lot of money.After that i can't find any info of this item, some watchmakers told me is quite old maybe somewhere 1930 some others can't even decide the year this one was produced. I 've send an email to official tissot and this is the answer:
"Congratulation for this beautiful watch.

It is quite old and we cannot give more details without a deep archive search.

Indeed vintage models are more difficult than it seems to identify.

Our archive department proposes historical search for such watches, but the cost is 100 Swiss Francs (if successful, otherwise it will be free).

Tell us if you are interested by such service and keep in mind that, in case of interest, we would need to have pictures of inside parts of the watch such as the movement, which means either sending the watch to us HQ or have the job done by a watchmaker."
The problem is i don't trust anyone here in Greece... I can't give something that i don't know how it costs to be sent in another country without warranty...

Did you get an estimate of €6k to 10k for it in 2010? I will be very surprised.
Current monetary price( taking into account its age and rarity) will not far exceed the current gold price with can be roughly calculated by weighing the watch and deducting 15-20 gms for movement crystal etc. my guess is it will fall significantly short of the 2010 estimate.

Don’t spend too much money on paper work if your intention is to sell. But go ahead if you plan to keep it. The story and it’s provenance will be priceless to you. If you sell it it’s probably headed for the pot. Unfortunately the rarity and history of these watches are not worth anything close to the current gold prices.

I am gueesing the same thing.. Ofc i don't wanna sell it cause it's a gift from grandma/mama/children etc., but you know when you own something old you need to know if it costs something more than the gold value. Propably i will head up to a watchmaker to open this so i can take some pic's from the inside, at least i may find the production year.

The only one sign is in the bracelet "18K". Nothing more in the back, nothing in the chain except the " T" Letter in the button. The only way it to move to a watchmaker to open this.. Thanks a lot.!

No.! I am too noob in watches and generally in all accesories.. Think about i never wear watch(hate them)except a smartwatch the last two years. Weight it or not means nothing on me cause i only know the gold value, and i wanna know if it costs something more cause it's old or rare etc..