Here is another numismatic product issued to commemorate Singapore Independence Golden Jubilee 1965-2015. A total of 5000 sheets were offered to the public at an issue price of S$300 per sheet/folder. This $50 3-Uncut sheet is also printed with the special prefix/serial number of SG50 in blue and gold/brown colours (normal notes printed with just gold/brown colour and not with SG50 prefix). Based on the total single notes issued ie S1 (50,000), S2 (15,000), S5 (5,000), S6 (1,000), S7 (150) and S8 (100), which give us a grand total of 71,250 individual notes. However, I have sighted a single note with serial number commencing 090000+. In view of this, one can arguably say that at least 100,000 pieces were printed, unless the serial numbers used for this series were not printed in sequential order from say #000001 to #071250. Here I have not included those rejected notes that may have errors or flaws during the manufacturing process as I do not have such information with me. It is also not known if any replacement prefix is used either, however, if these notes were printed by NPA, then one would not expect any. From the above, it is fair to say that only 71,250 notes (including the 3 Uncut Sheets) were sold by Noel Gifts International Limited in various presentation folders. MAS may have retained certain quantity, either for their archive or to be sold, most likely via public auction, at a later date. Such notes would have low and fancy serial numbers printed on it, perhaps also including other uncut sheet varieties ie full sheet, half sheet, 8 uncut sheet etc.
Your guess is as good as mine!