During His Period, Gold coins minted in multiple cities, breaking the rule of minting gold coins at the capital only.

Madinat Al-Salam written on Obverse, year 198 AH ONLY

Gold Dinar with word Al-Iraq, Minted in Madinat Al-Salam, 3.62 gm, 17.36 mm

Gold Dinar with Name Al-Ma'amoon:

Gold Dinar with word Al-Maghrib:

Gold Dinar with word Al-Mashriq:

Gold Dinar with word Ifriqya:

Armenia:

Arran:

Balakh:

Al-Basra:

Bukhara:

Dimashq:

Fars:

Herat:

Isfahan:197 AH, 2.84 gm, 22.38 mm

Isfahan: 200 AH, 3.19 mm, 24.50 mm

Al-Kufa:206 AH, 2.15, 23.98 mm

Al-Mada'in:

Ma'adan Bajunais:

Ma'adan Al-Shash:

Madinat Al-Salam, 198 AH,
with Lil Khalifa Al-Ma'moon on the reverse above  and -Hamd- below
This is to show that Al-Ma'moon was the real khalif and in control of Madinat Al-Salam after killing his Brother! Al-Ameen.
This is a rare date, perhaps the only example known, it also comes in Gold, very pricy.

Madinat Al-Salam:199 AH, 2.97 gm, 25.16 mm

Madinat Al-Salam: 200 AH, 2.91 gm, 24.77 mm

Madinat Al-Salam: 200 AH, 2.97 gm, 24.63 mm

Madinat Al-Salam: 202 AH, 2.99 gm, 25.18 mm

Madinat Al-Salam: 203 AH, 3.02 gm, 23.83 mm

Madinat Al-Salam: 203 AH, 2.92 gm, 26.26 mm

Madinat Al-Salam: 204 AH, 2.92 gm, 25.31 mm

Madinat Al-Salam: 204 AH, 2.96 gm, 27.11 mm

Madinat Al-Salam: 205 AH, 2.95 gm, 26.02 mm

Madinat Al-Salam: 206 AH, 2.94 gm, 25.67 mm

Madinat Al-Salam: 207 AH, 2.93 gm, 25.80 mm

Madinat Al-Salam: 214 AH, 2.91 gm, 26.50 mm

Macca:

Marow:

Misr:

Al-Muhammadiyyah: 205 AH, 2.90 gm, 24.21 mm

Nisapour:

Al-Rafiqa:

Al-Raqqa:

Madinat Samarqand: 196 AH, 3.20 gm, 24.47 mm

Madinat Samarqand: 205 AH, 2.92 gm, 25.4 mm, Citing Dhu Al-Riyasatain

Samarqand, 20(2) AH, Citing Al-Ridha as Heir, 2.51 gm, 25.90 mm, VERY RARE

Al-Shash:

Wasit:

Al-Rafiqa : 208 AH, 2.85 gm, 22.09 mm

Sijistan: 198 AH, 2.05 gm, 19.52 mm