SINCERELY by MARI HAMADA (浜田 麻里) has sold 400,000 copies in Japan.
SINCERELY certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Japan |
400,000 | 1x Platinum | January 1990 |
Japan Sales: 400,000
Certification / note: 1x Platinum
Certification Date / sales as of: January 1990
|
| Total sales | 400,000 | (in 1 country) |
Total
Sales: 400,000
(in 1 country)
|
Year-end chart performance for SINCERELY
| Chart 1990 | Rank | Sales |
| Japanese Albums (Oricon) |
57 | 238,840 |