Actually I think I can answer most of my questions. Different websites give different measurements and I have checked my Chanel Classic Flap Medium and 2.55 Reissue measurements and the way the size is reported varies as it may be based on whether the chain area is included in the height measurements or however the person decides to measure the size I guess. Im pretty sure the bag I asked about is the Extra mini.
Hopefully these photos and measurements guide will help other members!
http://www.********.com/wp-content/uploads/2016/06/d5111acc-c7d5-49e5-8a6c-edfc325ec677.jpeg
http://www.********.com/wp-content/uploads/2015/06/ChanelFamilyAll.jpg
I think the guide on Chanelprices.com is pretty accurate and gives a great guide on all Chanel bag measurements (minis included)
http://www.chanelprices.com/s/chanel-bag-dimensions.html
Style Style Code Size in cm Size in Inches
Classic Flap - Extra Mini A65050 17 x 10 x 7.5 cm 6.7" x 3.9" x 3"
Classic Flap - Mini(Square) A35200 17 x 13 x 6.5 cm 6.5" x 5" x 2.5"
Classic Flap - New Mini A69900 20 x 13 x 5 cm 8" x 5" x 2"
Classic Flap - Small A01113 23.5 x 14.5 x 6.5 cm 9.3" x 5.7" x 2.6"
Classic Flap - Medium A01112 25.5 x 16 x 7.5 cm 10" x 6.3" x 3"
Classic Flap - Jumbo A58600 30 x 20 x 10 cm 11.8" x 7.9" x 3.9"
Classic Flap - Maxi A58601 34 x 23 x 10 cm 13.4" x 9.1" x 3.9"
2.55 Reissue - 224 A37584 20 x 14.5 x 7.5 cm 7.9" x 5.7" x 3"
2.55 Reissue - 225 A37586 24 x 16 x 7 cm 9.4" x 6.3" x 2.8"
2.55 Reissue - 226 A37587 28 x 19 x 6 cm 11" x 6.7" x 3.3"
2.55 Reissue - 227 A37590 31.5 x 20 x 10 cm 12.6" x 7.5" x 3.7"
Timeless Clutch A32342 25.5 x 10 x 6.5 cm 10" x 4" x 2.5"
GST (Grand Shopping Tote) A50995 33 x 25.5 x 13.5 cm 13" x 10" x 5.25"
PST (Petit Shopping Tote) A50994 25.5 x 24 x 9 cm 10" x 9.5" x 3.5"
PTT (Petit Timeless Tote) A58004 25.5 x 18 x 11.5 cm 10" x 7" x 4.5"
Medallion Tote A01804 29 x 25.5 x 14 cm 11.5" x 10" x 5.5"
Cerf Tote (Executive Tote) A15206 35.5 x 25.5 x 15 cm 14" x 10" x 6"
Quilted Boy Flap - Small A67085 20 x 12 x 8 cm 7.9" x 4.7" x 3.1"
Quilted Boy Flap - Medium A67086 25 x 15 x 9 cm 9.8" x 5.9" x 3.5"
Quilted Boy Flap - New Medium A92193 28 x 18 x 9 cm 11" x 7" x 3.5"
Quilted Boy Flap - Large A67087 30 x 21 x 10 cm 11.8" x 8.3" x 3.9"
Quilted Boy Tote A66385 32 x 23 x 16.5 cm 12.6" x 9.1" x 6.5"