National Theatre Supply Company Sirryplex projector. a-c motor model # 5ksa47ci, type ksa, frame 4/7, form, c, volts 110, with many pieces and parts

Manufacturer: National Theatre Supply Co. (Simplex brand)
Model: Likely Simplex E-7 (based on body style and reel design)
Motor: A-C motor, model #5KSA47CI, Type KSA, Frame 4/7, Form C, Volts 110
Era: Circa 1930s–1950s
Category: Vintage Electronics / Cinema Equipment
Medium: Cast iron, steel, bakelite, and aluminum with bakelite switchgear and wiring
Dimensions: Approx. 5 ft tall
Condition: Good (light surface wear, appears complete; untested)

Description & History

This is a classic Simplex 35mm projector, one of the most enduring and respected models used in theaters from the 1920s through the mid-20th century. Often found in prominent cinemas, churches, and institutional auditoriums, the Simplex E-7 was a staple of film exhibition. The attached dual-reel heads, carbon arc lamphouse (likely original), and the intact base with original wiring harnesses indicate a well-preserved unit.

The motor listed — GE 5KSA47CI — is an AC synchronous motor used widely in industrial applications, which aligns with the mechanical requirements of the Simplex projector system.

The ownership by a Catholic nonprofit further supports this item’s historical use for educational or communal film screenings, a common practice through the mid-1900s.

Authentication

• The Simplex logo is correct and era-appropriate.
• The lamphouse and mechanism style is consistent with Simplex E-7 and similar models used pre-automation.
• The dual reel housings and fire safety shutters are correct for vintage theatrical use.
• The motor tag identifies the correct electrical specs.

Current Market Value

The value varies significantly depending on completeness and working condition:

• As-is, unrestored but intact: $600 – $1,200 USD
• Restored and operational (or museum-display ready): $1,500 – $3,000+ USD
• Parts value (if incomplete): $300 – $800 USD

Museums, collectors, and restored home theaters represent the primary buyer base.

Recommendations

• Preservation: If this will not be restored, preserve in a dry, dust-free environment and avoid plugging in without full electrical inspection due to old wiring.
• Restoration Potential: Restoration can greatly increase value and historical interest but should be done by a cinema equipment specialist.
• Professional Appraisal: Contacting a vintage theater equipment specialist or auctioneer (like Bonhams or Julien’s Auctions) is recommended for documentation and potential resale planning, especially if used for fundraising or institutional display.