Substandard original lots

a. Any lot or parcel of land with frontage on a street but having a lot width or area of lesser amounts than required in article V may be used for any purpose permitted in the zoning district in which it is located, provided such lot or parcel of land was shown on a recorded plat [or] recorded deed in the office of the town clerk on the effective date of this ordinance, or any prior ordinance or amendment rendering it substandard.