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Tax - the 1016 is quite collectable and I would think would be a good investment if bought at the right price. You would do well to find one with box and papers bearing in mind it's age, and would add possibly 15% to the price.
Trying to buy a vintage or second hand watch in LOS with b&p is a rare find. For some reason Thai dealers do not get hung up on these details - possibly due to the number of times they change hands.
I would never buy a Rolex from any dealer in MBK at best you will get a "Franken" watch.
If you are not a Rolex geek I would suggest that you make part of any deal you do,to personally have the watch authenicicated by the Rolex Centre in BKK - I think they charge circa bt1500 - the price of peace of mind.
Have a look at chrono24.com.au for pricing on all models - as they tend to be worldwide dealers, it is more a guide than a recommended purchase point.
Caller - the Rolex watch I purchased in Leng's was model 68258, I had been searching for a mint or almost mint one for a long time, hard to get with original bezel etc.(For my wife) this outlet was lucky that they had exactly what I wanted - still disappointed with the lousy discount.
They had a Rolex Daytona 16528 - beautiful - at a fairish price but certainly no bargain.
They offered no discount again and wanted to charge me for an extra link - which had obviously been removed for the previous owner, they only accept cash and as this was not what I had came to purchase I declined.
Shop is worth a visit very pro and they know their watches.