An Iron Cross First Class 1914 by Unknown/Unusual Maker

Item #G31560

$270
Silver frame, with iron core, magnetic, maker marked "Y" (unknown) on the underside of the pin, marked "800" (silver) on the reverse, 43.5 mm, vertical pinback, extremely fine.
 
Footnote: This unknown maker began supplying Iron Crosses in 1917, the "800" silver content only used to manufacture Iron Crosses during the period 1917-1918.(C:171)