If it's .550, not just 550 it is referring to the percent (.550x100=55%) of silver the product is made from.
The marking "925-1000" on sterling silver indicates that the piece is 92.5% pure silver, which is the standard for sterling silver. The "550" marking could represent the specific manufacturer or designer of the piece.
This represents the purity of the silver. "925" means the item is 92.5% pure silver; "1000" is the millesimal fineness, indicating it is 92.5% pure; and "550" is likely a maker's mark or design number.
January, 1951
Many vintage pieces of hammered aluminum are numbered. I think it is similar to a serial number in that all items with the same shape and design would have the same number.
All 500-series projectors can take the 593 tray.
yes- see the link below marked PICTURES
Mean average of 175, 550, 750 & 1100 (175+550+750+1100)/4 = 643.75
220
The answer should be -10% as the discount price 10% more than the original price.
It means 550-330 years before common era. BCE stands for before common era.
If you mean the DSLR camera its Sony.
550 + 550 = 1100