as stated above, it needs a CLA.
All speeds below 1/100 are based on the delay gear train which is set for 1 second and may have a secondary setting for 1/15 or 1/25. The slowest speeds depend on the delay mechanism operating its full travel. Fast slow speeds are due to the delay not setting or not going to its travel limit.
Although faster speeds may sound good they are most likely off by 1/2 stop or more.
1/100 - 1/125 is the speed the main cocking spring will operate the shutter blades with the delay locked out. Speeds above 1/125 are achieved by adding booster spring tension to the blade closing.