This discussion focuses on restoring a Sessions Drop Octagon clock dial, including rust stain removal, foxing identification, tin dial-pan cleaning, and options for replacing or aging a new paper dial.
Understanding the Condition of the Sessions Dial
Paper dial on a tin-plated steel pan
The Sessions Drop Octagon uses a paper dial adhered to a tin-plated steel dial-pan, which is prone to rust migration.
Rust stains penetrating the paper
Moisture exposure causes rust to migrate through the paper, creating brown spots that cannot be fully removed.
Foxing mistaken for rust
Some brown spots may be foxing—mold-related discoloration caused by high humidity rather than metal corrosion.
Blackened exposed metal
The uncovered dial-pan often shows black oxidation where tin plating has worn away.
Bezel polishing successful
The brass bezel can be polished to restore shine even if the dial cannot be fully corrected.
Cleaning Rust Stains and Foxing on the Paper Dial
Paper is extremely fragile
Any moisture-based cleaning risks warping, blistering, or tearing the original paper dial.
Potato and baking soda method
A gentle, low-moisture approach uses a freshly cut potato dipped in baking soda to lightly lift stains.
CLR daubing with caution
Lightly dabbing CLR can reduce rust stains but must be neutralized with baking soda solution and used sparingly.
Avoid aggressive rubbing
Rubbing can remove printed numerals or damage the paper surface.
Matte lacquer sealing
After cleaning, a light matte lacquer spray can stabilize the dial and prevent further deterioration.
Cleaning the Tin Dial-Pan
Blackened areas are exposed steel
Once tin plating wears away, the underlying steel oxidizes and darkens permanently.
Steel wool has limited effect
0000 steel wool may remove loose oxidation but cannot restore lost plating.
CLR can lighten oxidation
CLR may remove some surface darkening but cannot restore original tin brightness.
Replating option
The dial-pan can be nickel-plated or tin-plated professionally for a like-new appearance.
Painting alternative
Silver or chrome spray paint can mimic the original appearance at low cost.
Dial Replacement and Aging Options
New paper dial replacement
Replacement Sessions paper dials are widely available and inexpensive.
Aging with tea staining
A new dial can be aged with tea to match the clock’s vintage appearance.
Pie-crimped dials
Some Sessions dials are pie-crimped into the bezel and require careful removal.
Preserving originality
Many collectors prefer keeping the original dial despite imperfections.
Cost-benefit for inexpensive clocks
For a $20 clock, replacing the dial is a practical learning opportunity.
Movement and Case Notes
Movement cleaned and oiled
The Sessions movement was cleaned, bushings installed, and oiled successfully.
Case cleaned and restored
The wooden case responded well to cleaning and retained its original character.
Bezel polishing improves appearance
Polishing the brass bezel significantly enhances the overall look of the clock.
Dial imperfections are common
Many surviving Sessions clocks show rust or foxing on their original paper dials.
Final appearance acceptable
Many restorers choose to live with the original dial after cleaning.
FAQs
Can rust stains be fully removed?
No—rust that has migrated through paper cannot be completely eliminated.
Is the blackened dial-pan restorable?
Only by replating or repainting; oxidation cannot be polished away.
Should I replace the dial?
Replacement is inexpensive and practical if the original is too damaged.
What causes foxing?
Foxing is mold-related discoloration from high humidity.
Is CLR safe for paper?
Only when lightly daubed and immediately neutralized; risk remains.
0 comments