How big the price gap of 1-numerical-mark difference for Straits Edward 1902 in mint state condition (2)

Question: How big the price gap among of these coins?

Answer:

If you are Malaysia collector, the following table is good for reference

Real payment = sold price + buyer premium + handling & postage + Malaysia custom tax

Remarks: 

• HA does not provide any mechanism or solution for tax avoidance or related activities
• FOREX cost is excluded.

Payment gap = USD 3635.80 - USD 2105.20 = USD 1530.60