10 7x5" White Coloured Envelopes (133x184mm - 5"1/4 x 7"1/4) for Greetings Card Crafts & Party Invitations - Packed by The CandyRushTM Charity : Amazon.co.uk: Stationery & Office Supplies
7 Bar Pointed Flap Envelopes (5 1/4 x 7 1/4) – Donahue Paper Emporium
25 A7 Antique Gold Shimmer Envelopes Paper Source 5 1/4 X7 1/4 Invitation Pointed Euro Flap Envelopes 80 Premium Envelopes Gold Wedding - Etsy UK
A7 Invitation Envelopes, Blank 60 White, 5 1/4 X 7 1/4 Inches for 5x7 Invites or Cards - Etsy UK
A7 Envelopes, 5 1/4" x 7 1/4", Sun Yellow, Square Flap, 24w (90gsm), 100 Qty | eBay