C210 PART 135 CHARTER PLT LANDED GEAR UP. THERE WAS ONLY MINOR DAMAGE TO THE BOTTOM OF THE FUSELAGE SKIN AND PROP.

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I BECAME DISTR BY TWR WHEN TOLD I WAS #2 FOR LNDG. I DID NOT KNOW THIS AS I WAS TURNING FOR A 2 MI FINAL FOR RWY 18. I LOOKED FOR OTHER ACFT; BUT DID NOT SEE THE ACFT; AND ASSUMED IT LANDED. I HAD BEGUN MY GUMPS UP TO 'GAS;' BUT AFTER DISTR; RESTARTED AT 'MIXTURE; PROP; SWITCHES/SEATBELTS.' I FLARED ON CTRLINE BUT CONTACTED GND AT IDLE. THERE WAS A PROP STRIKE BUT NO DAMAGE TO ACFT BUT SCRAPING ON THE BELLY OF ACFT. I NEVER DID SEE OTHER ACFT! ALTHOUGH NOT MEASURABLE; I ALSO BELIEVE THAT I WAS TIRED. I DID NOT SLEEP WELL THE NIGHT BEFORE AND WOULD BE A FACTOR IN THE INCIDENT. CORRECTIVE ACTIONS INCLUDE: 1) ALWAYS RESTART MEMORY ITEMS OR CHKLISTS IF INTERRUPTED. 2) DO NOT RELEASE GEAR HANDLE UNTIL GREEN LIGHT(S) AND VISUAL CONFIRMATION IF APPLICABLE. NOTE: SEVERAL PLTS AND I COULD NOT CLRLY DEFINE IN THE WRITTEN DESCRIPTIONS WHETHER THIS HAD TO BE RECEIVED OR SENT WITHIN 10 DAYS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE HAS BEEN NOTIFIED BY THE FAA FOR RE-EXAMINATION FOR HIS COMMERCIAL PLT CERTIFICATE. HE WAS ADVISED THAT ASRS TIMELY RPTING DOES NOT RELIEVE AIRMEN OF THE PLT RE-EXAMINATION. TIMELY RPTING MEANS 10 DAYS FROM DATE OF INCIDENT UNTIL POSTMARKED TO US. HE WAS FURTHER ADVISED THAT A GOOD HABIT TO DEVELOP WITH A HIGH WING ACFT IS TO LOOK OUT THE SIDE WINDOW FOR THE L MAIN LNDG GEAR. IF IT IS EXTENDED; THE MAIN WHEELS WILL BE DOWN AND UNABLE TO RETRACT SINCE THE GEAR DROPS DOWN BELOW THE FUSELAGE PRIOR TO RETRACTING INTO THE BOTTOM OF THE FUSELAGE.