Romano - Byzantine One Pound Weight

I have picked up several weights in 2019. This one is large: 1 As = 1 Libra = 323.8 grams, 56 x 56 mm and interesting. It is hard to tell from pictures where silver is still in the lettering and where most if missing. You can see two scrapes that I suspect were used to remove silver from the letters.

My pic shows lots of details. 

CNG's pic.

Romano - Byzantine One Pound Commercial Weight, 4th-6th centuries. Æ

Obv - Cross flanked by ÎA (some say Î is LI in ligature = one Roman pound or Libra); all within wreath

Rev - Blank.

Cf. Bendall 51.

VF, green-brown surfaces, a few scrapes.

323.8 grams

56 x 56 mm

I like to compare size of weights and coins. 

One pound weight and some smaller (3oz, 2oz & 1oz) weights.

One As shown several ways. The four scale weights are close to a Roman pound of 327 grams. The two one As coins weigh 204 grams and 40 grams.

How do we know what one As or one Libra is in grams. The weight below tells us that there are 72 solidi per Libra. If a gold solidus weighs 4.54 grams, then the As is 327 grams. 

I found this weight online at: https://funtofil.livejournal.com/67964.html

Circa 4th-6th century. Weight of 1 libra or 72 solidi (Brass ('orichalcum'), inlaid with silver and copper, 51x51x13mm, 320.44 g), a thick, square coin-weight with plain edges (as MAH B1), solidus of 4.45 g. Engraved on the top with inscription three lines, -Α / SOL / LXXII, within curved arch highlighted in silver; above to left and right, cross filled in silver; all within square frame of engraved lines enclosing a copper border. Rev. Plain. Bendall 152 var. An impressive and rare piece with gold-brown surfaces. Very fine or better.

From the Eparch Collection, acquired from a private collection in London.