Never saw a gold 2405 diaphragm.i have had many 077/2405 with blue outer ring..most if not all had some type of date/ number.avilable on eBay now.no affiliation.
Mr. Widget
07-15-2019, 11:45 AM
I really, really doubt those are actual JBL parts.
The packaging doesn’t even look like it came from JBL.