The 100 serial just means 4k lcd model.
If you can photo the lens blur post the info as @Pimax-Support posted 2 messages above yours.
Have you contacted the E Vendor? The E vendor is your prime contact for warranty.
The team here has sent out a variety of parts to fix issues. Head straps, lenses, front headset strap assembly etc.
Generally lettering has been used between batches mine was orange then i think blue & now black if not mistaken.