First up, veteran artist Frank Thorne contributes the pencils for issue 434, "The Nightmare Dummies and...The Spectre!". Let's have a quick look:
Well, this page doesn't look too bad, but I don't like the framing in that top tier. The visual flow in the entire issue is awkward, although Thorne's actual renderings are, typically, just fine.
Interestingly, Thorne gets to illustrate the apartment of Spectre's alter ego Jim Corrigan in this issue. When Aparo returns to the set a few issues later, in a solo-drawn installment, he faithfully recreates the furnishings and decor that Thorne established in 434. Very nice bit of set continuity, and quite unexpected.
Note also that Thorne essentially co-pencilled the cover, which faithfully recreates a scene from the interior. Sharp eyes will discern the Thorne-like qualities of the almost-headless animated dummy.
Now let's have a look at issue 438, "The Spectre Haunts the Museum of Fear". Editor Joe Orlando tasked DC's Bronze Age mainstay Ernie Chua (a.k.a. Ernie Chan) with the pencils for this installment.
Um...to put it tactfully, I was never a big fan of Chan's work. It had many of the characteristic techniques common to the many artists recruited from the Phillipines in the 1970's, without the flair that I admired in artists like Nestor Redondo, Alfredo Alcala, or Tony deZuniga, nor the quirks of guys like Gerry Talaoc or Rico Rival. Chan's work usually struck me as stiff and posed and unauthentic. His rendering of clothing is unconvincing here, and his expressions of action are, here at least, undynamic.
All in all, both jobs are perfectly adequate for the standards of the time, but for me, they somewhat spoil a memorable run.