Parker 75 Nib Hallmarking

[dicks390]

Hello-I recently acquired a Parker 75 Sterling Silver Cisele fountain pen.  The nib is gold in color, but is not hallmarked 14K, 585, etc.  I have acquired and sold many of these pens but have never seen a nib that was not hallmarked as to its gold content.  Can I assume it's 14K, or is it just gold plated? DId parker not hallmark all of it's gold nibs?  I am going to resell it, but do not want to state a gold content that is not true.  Thank you.

[FlighterGuy]

I can barely see the USA under the R in the 3rd picture and I think I can see a 4K under the P in the 1st picture so the 14K may be there.  So take another look under a strong loop. 

[dicks390]

Man, you have excellent eyes.  Upon closer inspection, USA and 14K are there, barely visible.  Thank you so much FlighterGuy.